Central nervous system effects of subdissociative doses of (S)-ketamine are related to plasma and brain concentrations measured with positron emission tomography in healthy volunteers*
作者:Per Hartvig、Johann Valtysson、Karl-Johan Lindner、Jens Kristensen、Rolf Karlsten、Lars L. Gustafsson、Jan Persson、Jan O. Svensson、Ivar Øye、Gunnar Antoni、Göran Westerberg、Bengt Långström
DOI:10.1016/0009-9236(95)90194-9
日期:1995.8
after administration, and decreased regional binding of (S)-ketamine in the brain and were consistently seen at plasma and maximum regional brain (S)-ketamine concentrations higher than 70 and 500 ng/ml, respectively. The magnitude of specific binding of (S)-ketamine, measured with positron emission tomography, can be related directly to drug effects.
在一项随机,双盲,交叉研究中,在五名志愿者中,分别以0、0.1和0.2 mg / kg剂量的(S)-氯胺酮对血浆浓度,最大区域大脑浓度和大脑中的特定区域结合进行了测量。与镇痛,健忘和情绪变化等诱发效应有关。通过同时施用通过正电子发射断层扫描术定量的(S)-[N-甲基-11C]氯胺酮评估大脑中的特异性结合。脑中高放射性对应于N-甲基-D-天冬氨酸受体复合物的区域分布。由于(S)-[N-甲基-11C]氯胺酮的置换,测量到显着且剂量依赖性的结合减少。记忆障碍和拟精神病效应与给药后4分钟的剂量,血浆浓度有关,和(S)-氯胺酮在大脑中的区域结合减少,并且分别在血浆和最大区域脑(S)-氯胺酮浓度分别高于70和500 ng / ml时一致观察到。用正电子发射断层扫描法测量的(S)-氯胺酮的特异性结合程度可以直接与药物作用有关。